Macgregor, Nicholas; Cockburn, Andrew
Descriptive studies of provisioning in cooperatively breeding superb fairy-wrens, Malurus cyaneus, show that females are responsive to the needs of the brood, increasing nest visits with brood size and age. Both dominant and helper males provision at a constant rate regardless of brood size and age, but dominant males reduce provisioning as the number of helpers increases. This reduction could reflect load lightening or reduced relatedness, as dominants are more likely to be cuckolded by...[Show more]
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